The Boiling River: The Amazon’s 200-Degree Stream

Deep in Peru’s Amazon, in the Huánuco region, a river steams through the rainforest. Its local name is Shanay-Timpishka. It starts out normal. At its headwaters the water is about 81°F, like any jungle stream. Then, along its lower 6.3 km, hot springs pour in, and the temperature climbs. The hottest stretch averages nearly 203°F, and one spring measured 210.4°F, just short of boiling. The river can be up to about 30 meters wide and 4.5 meters deep. Geothermal scientist Andrés Ruzo first heard about the river as a child from his grandfather. Years later, he went looking for it and set out to explain how it could exist. Rivers this hot are usually found near volcanoes, but there’s no active volcano or geothermal vent anywhere nearby. The leading explanation is that rainwater seeps deep into the ground through fault zones. Down there, the Earth’s natural heat warms it. Then it rises back up through hot springs and floods into the river. Local shamans tell a different story. They say the hot water is born from Yacumama, a giant serpent spirit known as the Mother of the Waters. Three communities sit along its banks today. The forest around them is under pressure from deforestation, which makes the river’s protected stretches increasingly rare.